CN117162541A - Sandwich board with hemispherical honeycomb core layer and preparation method thereof - Google Patents
Sandwich board with hemispherical honeycomb core layer and preparation method thereof Download PDFInfo
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- CN117162541A CN117162541A CN202311453171.5A CN202311453171A CN117162541A CN 117162541 A CN117162541 A CN 117162541A CN 202311453171 A CN202311453171 A CN 202311453171A CN 117162541 A CN117162541 A CN 117162541A
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- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 14
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Abstract
The invention relates to a sandwich board with a hemispherical honeycomb core layer and a preparation method thereof, wherein the steps are as follows; cutting the continuous fiber prepreg into a plurality of strip-shaped paving materials in long strips and a plurality of fan-shaped paving materials; laying a plurality of strip-shaped paving materials on hemispherical bosses of each corresponding row according to a set angle, dividing each hemispherical boss by taking the strip-shaped paving materials as datum lines after each row of strip-shaped paving materials is laid, coating fan-shaped Pu Cai on two sides of each hemispherical boss covered with the strip-shaped paving materials, and finishing coating of the hemispherical bosses of each row according to the process, wherein the set angles are sequentially +45°, -45 °, 0 °, 90 °, 0 °, -45 ° and +45 °; repeating for 2-10 times, paving, performing compression molding, curing and demolding to obtain a hemispherical honeycomb structure core layer; and (3) preparing a base plate of the composite material, adhering the two base plates to the hemispherical honeycomb structure core layer, and curing to obtain the sandwich plate.
Description
Technical Field
The invention relates to the technical field of energy-absorbing composite material preparation, in particular to a sandwich panel with a hemispherical honeycomb core layer and a preparation method thereof.
Background
The column cladding sandwich board has excellent performance in energy absorption and shock absorption, and has high specific strength and specific rigidity, so that the column cladding sandwich board is widely applied to the field of protection. The column cell structure mainly comprises metal pipe parts, and is mainly composed of square pipes or round pipes, multicell pipe units and hemispherical shell units. At present, the widely used hemispherical shell sandwich structure is made of aluminum materials, and the upper bottom plate and the lower bottom plate are manufactured in a gluing or welding mode.
However, the geometric unit structure of the column cell unit of the hemispherical thin-shell structure sandwich board is complex and is easy to deform during processing, the requirements on the size and the precision of the column cell unit cannot be met, the main factors influencing the processing precision of the column cell unit are defects of thin wall wrinkling, cracking, uneven thickness of different parts and the like in the stamping forming process, vibration and deformation are easy to generate during cutting processing, the processing quality is influenced, the stability of a bonding interface produced by adopting a glue mode of the upper metal bottom plate and the lower metal bottom plate is poor, the production procedure is complex by adopting a welding mode, and the production cost is high.
Accordingly, there is an urgent need for providing a sandwich panel with a hemispherical honeycomb core layer and a method for manufacturing the same.
Disclosure of Invention
The invention aims to provide a sandwich board with a hemispherical honeycomb core layer and a preparation method thereof, and solves the technical problems that the geometric unit structure of a column cell unit of the conventional sandwich board with a hemispherical thin shell structure is complex, the processing is easy to deform, and the requirements on the size and the precision of the column cell unit cannot be met through the proposal of the preparation method of the sandwich board with the hemispherical honeycomb core layer.
The invention provides a preparation method of a sandwich panel with a hemispherical honeycomb core layer, which comprises the following steps:
preparing a die, wherein the die comprises a male die and a female die, the male die comprises a lower plate, a plurality of hemispherical bosses are uniformly distributed on the upper end face of the lower plate at intervals in the transverse and longitudinal directions, the female die comprises an upper plate, and hemispherical grooves which are in one-to-one correspondence with the hemispherical bosses are formed in the lower plate face of the upper plate;
cutting a continuous fiber prepreg into a plurality of strip-shaped paving materials in long strips and a plurality of sector paving materials matched with hemispherical bosses;
the two adjacent sides of the lower plate are the horizontal and vertical coordinates, a plurality of strip-shaped paving materials are paved on the hemispherical bosses of each corresponding row according to set angles, after each row of strip-shaped paving materials are paved, each hemispherical boss is divided by taking the strip-shaped paving materials as datum lines, the two sides of each hemispherical boss covered with the strip-shaped paving materials are covered with sectors Pu Cai, and according to the process, the covering of the hemispherical bosses of each row is completed, wherein the set angles are +45 degrees, -45 degrees, 0 degrees, 90 degrees, -45 degrees and +45 degrees in sequence;
repeating the process for 2-10 times, laying, covering a female die on a male die, performing die pressing and curing on a core layer, and demolding to obtain a hemispherical honeycomb structure core layer;
preparing flat plates with the same size as the hemispherical honeycomb core layer, taking the adjacent edges of each flat plate as the horizontal and vertical coordinates, paving continuous fiber prepregs on one surface of each flat plate according to angles of +45°, -45 °, 0 °, 90 °, 0 °, 45 ° and +45°, finishing one-time paving, paving for 2-10 times, and heating and solidifying the flat plates after paving to obtain a bottom plate;
and adhering the two bottom plates to the upper end face and the lower end face of the hemispherical honeycomb structure core layer through an adhesive, and curing to obtain the sandwich plate with the hemispherical honeycomb core layer.
Preferably, a plurality of induction holes penetrating through the sandwich plate are formed on the sandwich plate with the hemispherical honeycomb core layer at intervals in the circumferential direction.
Preferably, during the heat curing of the base plate, the base plate is heated to 60 DEG C ~ Heating to 60 ℃ at a heating rate of 90 ℃/h ~ 120 ℃; at 0.3 ~ Preserving heat under 1MPa pressure of 0.5 ~ 2h。
Preferably, the adhesive is a resin-based adhesive film or glue, wherein the resin-based adhesive film or glue is one of epoxy resin, bismaleimide resin, benzoxazine resin and phthalonitrile.
Preferably, in the core layer mould pressing solidification process, the temperature is increased to 120-280 ℃ at the heating rate of 30-60 ℃/h; preserving heat for 1-6 h under the pressure of 0.3-5 MPa;
and (5) lowering the temperature to 20-60 ℃ for demoulding to obtain the hemispherical honeycomb structure core layer.
Preferably, the inner diameter of the induction hole is 12-26mm; the thickness of the bottom plate is 0.54-2.5mm.
Preferably, the continuous fibers in the continuous fiber prepreg comprise one or more of carbon fibers, glass fibers, basalt fibers, quartz fibers and aramid fibers.
Preferably, the upper plate of the female die comprises a connecting layer and a top layer from bottom to top, the hemispherical grooves are positioned on one end surface of the connecting layer, the other surface of the connecting layer is provided with protrusions corresponding to the hemispherical grooves one by one, and one side of the top layer is provided with a top layer groove corresponding to the protrusions one by one;
the upper handrails are arranged at intervals in the circumferential direction of the top layer, and the lower handrails are arranged at intervals in the circumferential direction of the lower plate;
the resin matrix in the prepreg comprises at least one of epoxy resin, polyimide resin, bismaleimide resin, benzoxazine resin or phthalonitrile;
the number of the hemispherical bosses is 10-100; the diameter of the hemispherical boss is 10-100mm, and the diameter of the hemispherical groove is 12-106mm.
Preferably, the glass transition temperature of the resin used for the continuous fiber prepreg is not less than 160 ℃; the resin content in the continuous fiber prepreg is 29-44 wt%;
the single-layer thickness of the continuous fiber prepreg is 0.05-0.4 mm, the volatile content is 5-10%, and the areal density of the continuous fiber prepreg is 50-280 g/m 3 ；
The male die and the female die are made of one of steel, aluminum and silicon rubber, and the linear expansion coefficient of the selected materials of the male die and the female die is 3-11 multiplied by 10 -6 And the roughness Ra is less than or equal to 1.5 at the temperature of/DEGC.
The invention also provides a sandwich panel with the hemispherical honeycomb core layer, which is obtained based on the preparation method of the sandwich panel with the hemispherical honeycomb core layer, and comprises a core layer, wherein the upper end face and the lower end face of the core layer are adhered with bottom plates.
Compared with the prior art, the sandwich board with the hemispherical honeycomb core layer and the preparation method thereof provided by the invention have the following steps:
1. according to the preparation method of the sandwich board with the hemispherical honeycomb core layer, continuous fiber prepreg is cut, multi-layer paving is carried out according to angles, and the hemispherical honeycomb core layer and the base board are respectively obtained, so that the requirements on the required mechanical properties and the thicknesses of the hemispherical honeycomb core layer and the base board are ensured, and furthermore, the sandwich board with the hemispherical honeycomb core layer and the base board are formed by compression molding with chopped fibers, and the compressive resistance and the impact resistance of the hemispherical honeycomb core layer and the base board can be improved by selecting continuous fibers, so that the sandwich board with the hemispherical honeycomb core layer with high performance is obtained.
2. The invention can use middle-low temperature epoxy resin, and can also select resin with better temperature resistance, namely, the glass transition temperature is above 160 ℃, the long-term use temperature is above 100 ℃, for example, benzoxazine, bismaleimide resin, polyimide resin and the like are used as a matrix to produce the honeycomb structure core layer and the base plate, so that the temperature resistance of the honeycomb structure and the base plate is improved.
3. According to the invention, through the design of the die, the dimensional accuracy of the produced honeycomb structure core layer is high; the continuous fiber laying method is simple to operate, prepreg laying can be carried out on a die only according to the designed laying design, the core layer structure produced by adopting the die pressing process can be used only by trimming, and compared with the interlocking assembly process, the method reduces the processing and bonding procedures and has fewer production procedures.
4. The continuous fiber paving integrated forming mode adopted by the invention is used for respectively preparing the bottom plate and the honeycomb structure core layer, so that the sandwich structure of the bottom plate, the honeycomb structure core layer and the bottom plate from top to bottom is formed, the preparation method is simple, the size is easy to control, and the size precision is high.
5. The hemispherical thin shell sandwich composite material is connected with the bonding interface of the upper base plate and the lower base plate in the same-system bonding mode, so that the stability is high.
6. The preparation method of the sandwich panel with the hemispherical honeycomb core layer provided by the invention can change the resin matrix, can prepare the sandwich panel with the hemispherical honeycomb core layer meeting different working conditions, and widens the use environment of the sandwich panel with the hemispherical honeycomb core layer.
7. According to the preparation method of the sandwich panel with the hemispherical honeycomb core layer, the core layer and the bottom plate are both prepared from the composite material, the obtained sandwich panel with the hemispherical honeycomb core layer is light in weight, and the requirement on light weight is met. The sandwich board of the hemispherical honeycomb core layer has high tensile strength, good corrosion resistance and very simple bonding process, and can ensure that the obtained sandwich board of the hemispherical honeycomb core layer has certain dynamic load strength and smaller deformation under the explosive impact load.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view (perspective view) of a male die according to the present invention;
FIG. 2 is a schematic view (perspective view) of a female die according to the present invention;
FIG. 3 is a schematic view (perspective view, bottom view) of the connecting layer according to the present invention;
FIG. 4 is a schematic view (perspective view, top view) of the connecting layer according to the present invention;
FIG. 5 is a schematic view (perspective view, bottom view) of the top layer according to the present invention;
FIG. 6 is a schematic view of the structure of the fan-shaped and bar-shaped mats according to the present invention;
fig. 7 is a schematic view showing the arrangement of the fan-shaped paving material and the strip-shaped paving material on the negative film according to the present invention;
FIG. 8 is a product view of a hemispherical honeycomb core according to the present invention;
fig. 9 is a schematic structural view (perspective view) of the sandwich panel according to the present invention.
Reference numerals:
1. a male mold; 2. a female die; 102. hemispherical boss; 103. a lower armrest; 201. hemispherical grooves; 202. a connection layer; 203. a top layer; 204. a protrusion; 205. a top layer groove; 206. an upper armrest; 9. a core layer; 10. a bottom plate; 11. and a guiding hole.
Detailed Description
The following description of the present invention will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention provides a preparation method of a sandwich panel with a hemispherical honeycomb core layer, which comprises the following steps:
s1) preparing a die, wherein the die comprises a male die and a female die, the male die comprises a lower plate 101, a plurality of hemispherical bosses 102 are uniformly distributed on the upper end surface of the lower plate 101 at intervals in the transverse and longitudinal directions, the female die comprises an upper plate 2, and hemispherical grooves 201 which are in one-to-one correspondence with the hemispherical bosses 102 are formed in the lower plate surface of the upper plate 2;
s2) cutting the continuous fiber prepreg into a plurality of strip-shaped paving materials in long strips and a plurality of fan-shaped paving materials matched with the hemispherical boss 102;
s3) taking two adjacent edges of the lower plate 101 as the horizontal and vertical coordinates, paving a plurality of strip-shaped paving materials on the hemispherical bosses 102 of each corresponding row according to set angles, dividing each hemispherical boss 102 by taking the strip-shaped paving materials as datum lines after each row of strip-shaped paving materials is paved, coating fan-shaped Pu Cai on two sides of each hemispherical boss 102 covered with the strip-shaped paving materials, and finishing coating of the hemispherical bosses 102 of each row according to the process, wherein the set angles are sequentially +45°, -45 °, 0 °, 90 °, 0 °, -45 ° and +45°;
s4) repeating the process for 2-10 times, laying, arranging a female die cover on the male die 1, performing die pressing, solidifying and demolding to obtain a hemispherical honeycomb structure core layer;
s5) preparing flat plates with the same size as the hemispherical honeycomb core layer, taking the adjacent edges of each flat plate as the horizontal and vertical coordinates, paving continuous fiber prepregs on one surface of each flat plate according to angles of +45°, -45 °, 0 °, 90 °, 0 °, 45 ° and +45°, finishing one-time paving, paving for 2-10 times, and heating and solidifying the flat plates after paving to obtain a bottom plate;
s6) cutting the hemispherical honeycomb structure core layer to be the same as the shape of the bottom plates, adhering the two bottom plates to the upper end face and the lower end face of the hemispherical honeycomb structure core layer through adhesives, and solidifying to obtain the sandwich plate with the hemispherical honeycomb core layer.
Specifically, a plurality of induced holes penetrating through the sandwich plate are formed in the sandwich plate with the hemispherical honeycomb core layer at intervals in the circumferential direction.
Specifically, when the hole is opened, the rotating speed of the cutter is 1000-3000r/min, the feeding speed is 40-300mm/min, and the feeding amount is 0.02-0.5mm.
Specifically, during the heating and curing process of the bottom plate, the temperature of the bottom plate is 60 ~ Heating to 60 ℃ at a heating rate of 90 ℃/h ~ 120 ℃; at 0.3 ~ Preserving heat under 1MPa pressure of 0.5 ~ 2h。
Specifically, the adhesive is resin-based adhesive film or glue, wherein the resin-based adhesive film or glue is one of epoxy resin, bismaleimide resin, benzoxazine resin and phthalonitrile.
Specifically, in the core layer mould pressing solidification process, the temperature is increased to 120-280 ℃ at the heating rate of 30-60 ℃/h; preserving heat for 1-6 h under the pressure of 0.3-5 MPa; and (5) lowering the temperature to 20-60 ℃ for demoulding to obtain the hemispherical honeycomb structure core layer.
Specifically, the inner diameter of the induction hole is 12-26mm; the thickness of the bottom plate is 0.54-2.5mm.
Specifically, the continuous fibers in the continuous fiber prepreg comprise one or more of carbon fibers, glass fibers, basalt fibers, quartz fibers and aramid fibers.
Specifically, the upper plate 2 of the female die comprises a connecting layer 202 and a top layer 203 from bottom to top, the hemispherical grooves 201 are positioned on one end surface of the connecting layer 202, the other surface of the connecting layer 202 is provided with protrusions 204 which are in one-to-one correspondence with the hemispherical grooves 201, and one side of the top layer 203 is provided with top layer grooves 205 which are in one-to-one correspondence with the protrusions 204;
the top layer 203 is circumferentially spaced apart with upper armrests 206 and the lower plate 101 is circumferentially spaced apart with lower armrests 103.
Specifically, the resin matrix in the prepreg includes at least one of epoxy resin, polyimide resin, bismaleimide resin, benzoxazine resin, or phthalonitrile.
Specifically, the number of hemispherical bosses is 10-100; the diameter of the hemispherical boss is 10-100mm, and the diameter of the hemispherical groove is 12-106mm.
Specifically, the glass transition temperature of the resin used for the continuous fiber prepreg is more than or equal to 160 ℃; the resin content in the continuous fiber prepreg is 29 to 44wt%.
Specifically, the single-layer thickness of the continuous fiber prepreg is 0.05-0.4 mm, the volatile content is 5-10%, and the surface density of the continuous fiber prepreg is 50-280 g/m 2 。
Specifically, the male die and the female die are made of one of steel, aluminum and silicon rubber, and the linear expansion coefficient of the selected materials of the male die and the female die is 3-11 multiplied by 10 -6 And the roughness Ra is less than or equal to 1.5 at the temperature of/DEGC.
The invention also provides a sandwich panel with the hemispherical honeycomb core layer obtained based on the preparation method of the sandwich panel with the hemispherical honeycomb core layer, which comprises a core layer 9, wherein the upper end surface and the lower end surface of the core layer 9 are adhered with a bottom plate 10, and a plurality of induced holes 11 are formed in the sandwich panel at intervals in the circumferential direction.
According to the preparation method of the sandwich board with the hemispherical honeycomb core layer, continuous fiber prepreg is cut, multi-layer paving is carried out according to angles, and the hemispherical honeycomb core layer and the base board are respectively obtained, so that the requirements on the required mechanical properties and the thicknesses of the hemispherical honeycomb core layer and the base board are ensured, and furthermore, the sandwich board with the hemispherical honeycomb core layer and the base board are formed by compression molding with chopped fibers, and the compressive resistance and the impact resistance of the hemispherical honeycomb core layer and the base board can be improved by selecting continuous fibers, so that the sandwich board with the hemispherical honeycomb core layer with high performance is obtained.
The invention can use middle-low temperature epoxy resin, and can also select resin with better temperature resistance, namely, the glass transition temperature is above 160 ℃, the long-term use temperature is above 100 ℃, for example, benzoxazine, bismaleimide resin, polyimide resin and the like are used as a matrix to produce the honeycomb structure core layer and the base plate, so that the temperature resistance of the honeycomb structure and the base plate is improved.
According to the invention, through the design of the die, the dimensional accuracy of the produced honeycomb structure core layer is high; the continuous fiber laying method is simple to operate, prepreg laying can be carried out on a die only according to the designed laying design, the core layer structure produced by adopting the die pressing process can be used only by trimming, and compared with the interlocking assembly process, the method reduces the processing and bonding procedures and has fewer production procedures.
The continuous fiber paving integrated forming mode adopted by the invention is used for respectively preparing the bottom plate and the honeycomb structure core layer, so that the sandwich structure of the bottom plate, the honeycomb structure core layer and the bottom plate from top to bottom is formed, the preparation method is simple, the size is easy to control, and the size precision is high.
The hemispherical thin shell sandwich composite material is connected with the bonding interface of the upper base plate and the lower base plate in the same-system bonding mode, so that the stability is high.
The preparation method of the sandwich panel with the hemispherical honeycomb core layer provided by the invention can change the resin matrix, can prepare the sandwich panel with the hemispherical honeycomb core layer meeting different working conditions, and widens the use environment of the sandwich panel with the hemispherical honeycomb core layer.
According to the preparation method of the sandwich panel with the hemispherical honeycomb core layer, the core layer and the bottom plate are both prepared from the composite material, the obtained sandwich panel with the hemispherical honeycomb core layer is light in weight, and the requirement on light weight is met. The sandwich board of the hemispherical honeycomb core layer has high tensile strength, good corrosion resistance and very simple bonding process, and can ensure that the obtained sandwich board of the hemispherical honeycomb core layer has certain dynamic load strength and smaller deformation under the explosive impact load.
Example 1
As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8 and 9, the preparation of the sandwich panel with the hemispherical honeycomb core layer comprises the following steps:
101 A) preparing a mould, wherein the mould comprises a male mould and a female mould, the male mould comprises a lower plate 101, a plurality of hemispherical bosses 102 are uniformly distributed on the upper end surface of the lower plate 101 at intervals in the transverse and longitudinal directions, the female mould comprises an upper plate 2, and hemispherical grooves 201 which are in one-to-one correspondence with the hemispherical bosses 102 are arranged on the lower plate surface of the upper plate 2; the size of the lower plate 101 is 100 multiplied by 100mm, and the diameter of the hemispherical boss is 10mm; the size of the upper plate 2 is 100 multiplied by 100mm, and the diameter of the hemispherical boss is 12mm; the material of the mould comprises one or more materials of steel, aluminum and silicon rubber, and the linear expansion coefficient of the material is 3-11 multiplied by 10 -6 The roughness Ra is less than or equal to 1.5, the number of the hemispherical bosses is 10, according to specific conditions,selecting the parameters to prepare a die;
102 Cutting the continuous fiber prepreg into a plurality of strip-shaped paving materials in long strips and a plurality of sector paving materials matched with the hemispherical boss 102;
103 Firstly, paving a strip-shaped paving material on hemispherical bosses 102 in a central row according to 45 degrees, after paving a strip-shaped paving material in each row, dividing each hemispherical boss 102 by taking the strip-shaped paving material as a datum line, coating sectors Pu Cai on two sides of each hemispherical boss 102 covered with the strip-shaped paving material, and finishing coating of the hemispherical bosses 102 in each row from the center to the outside according to the process, wherein the paving of angles of +45 degrees, -45 degrees, 0 degrees, 90 degrees, 0 degrees, -45 degrees and +45 degrees is sequentially finished;
104 Repeating the process for 2-10 times, laying, covering the female die on the male die 1, performing die pressing, solidifying and demolding to obtain a hemispherical honeycomb structure core layer; in the mould pressing solidification process, heating to 120 ℃ at a heating rate of 30 ℃/h; preserving heat for 1h under the pressure of 0.3 MPa; cooling to 20 ℃ for demoulding;
105 Preparing flat plates with the same size as the hemispherical honeycomb structure core layer, taking the adjacent edges of each flat plate as the horizontal and vertical coordinates, paving continuous fiber prepregs on one surface of each flat plate according to angles of +45°, -45 °, 0 °, 90 °, 0 °, 45 ° and +45°, finishing one-time paving, paving for 2-10 times, and heating and solidifying the flat plates after the paving is finished to obtain a bottom plate; wherein, in the heating and curing process of the bottom plate, the temperature is raised to 60 ℃ at a heating rate of 60 ℃/h; preserving heat for 0.5h under the pressure of 0.3 MPa;
106 Cutting the hemispherical honeycomb core layer into a shape identical to the shape of the bottom plates, adhering the two bottom plates to the upper end face and the lower end face of the hemispherical honeycomb core layer through an adhesive, and solidifying to obtain the sandwich plate with the hemispherical honeycomb core layer.
The obtained sandwich panel comprises a core layer 9, wherein a bottom plate 10 is adhered to the upper end face and the lower end face of the core layer 9, and a plurality of induction holes 11 are formed in the periphery of the sandwich panel at intervals.
The thickness of the single layer laid by the continuous fiber prepreg is 0.05-0.3mm.
Continuous fiber prepreg cut tape constructions include plain weave and twill weave.
A plurality of induction holes penetrating through the sandwich plate are formed in the periphery of the sandwich plate with the hemispherical honeycomb core layer at intervals; when the hole is opened, the rotating speed of the cutter is 1000-3000r/min, the feeding rate is 40-300mm/min, the feeding amount is 0.02-0.5mm, in the embodiment, the rotating speed of the cutter is 1200r/min, the feeding rate is 120mm/min, and the feeding amount is 0.05mm.
Specifically, during the heating and curing process of the bottom plate, the temperature of the bottom plate is 60 ~ Heating to 60 ℃ at a heating rate of 90 ℃/h ~ 120 ℃; at 0.3 ~ Preserving heat under 1MPa pressure of 0.5 ~ 2h。
The upper plate 2 of the female die comprises a connecting layer 202 and a top layer 203 from bottom to top, the hemispherical groove 201 is positioned on one end surface of the connecting layer 202, the other surface of the connecting layer 202 is provided with protrusions 204 which are in one-to-one correspondence with the hemispherical grooves 201, and one side of the top layer 203 is provided with a top layer groove 205 which is in one-to-one correspondence with the protrusions 204;
the top layer 203 is circumferentially spaced apart with upper armrests 206 and the lower plate 101 is circumferentially spaced apart with lower armrests 103.
The glass transition temperature of the resin used by the continuous fiber prepreg is more than or equal to 160 ℃; the resin content in the continuous fiber prepreg was 29wt%.
The continuous fiber prepreg had a single layer thickness of 0.05mm, a volatile content of 5%, and an areal density of 50g/m 2 。
The adhesive is glue, wherein the resin base is bismaleimide resin.
The continuous fibers in the continuous fiber prepreg comprise one or more of carbon fibers, glass fibers, basalt fibers, quartz fibers and aramid fibers; the resin matrix in the prepreg comprises at least one of epoxy resin, polyimide resin, bismaleimide resin, benzoxazine resin or phthalonitrile; the continuous fiber of the embodiment is a T800 carbon fiber fabric, and the resin matrix of the embodiment is a bismaleimide resin.
The physical properties of the sandwich panel of the hemispherical honeycomb core layer obtained in this example are shown in table 1.
Example two
201 A) preparing a mould, wherein the mould comprises a male mould and a female mould, the male mould comprises a lower plate 101, a plurality of hemispherical bosses 102 are uniformly distributed on the upper end surface of the lower plate 101 at intervals in the transverse and longitudinal directions, the female mould comprises an upper plate 2, and hemispherical grooves 201 which are in one-to-one correspondence with the hemispherical bosses 102 are arranged on the lower plate surface of the upper plate 2; the size of the lower plate 101 is 1000 multiplied by 1000mm, and the diameter of the hemispherical boss is 100mm; the size of the upper plate 2 is 1000 multiplied by 1000mm, and the diameter of the hemispherical boss is 106mm; the material of the die is aluminum, the linear expansion coefficient of the material is 3-11 multiplied by 10 < -6 >/DEG C, the roughness Ra is less than or equal to 1.5, and the number of hemispherical bosses is 200;
202 Cutting the continuous fiber prepreg into a plurality of strip-shaped paving materials in long strips and a plurality of sector paving materials matched with the hemispherical boss 102;
203 Firstly, paving a strip-shaped paving material on hemispherical bosses 102 in a central row according to 45 degrees, after paving a strip-shaped paving material in each row, dividing each hemispherical boss 102 by taking the strip-shaped paving material as a datum line, coating sectors Pu Cai on two sides of each hemispherical boss 102 covered with the strip-shaped paving material, and finishing coating of the hemispherical bosses 102 in each row from the center to the outside according to the process, wherein the paving of angles of +45 degrees, -45 degrees, 0 degrees, 90 degrees, 0 degrees, -45 degrees and +45 degrees is sequentially finished;
204 Repeating the process for 10 times, laying, arranging a female die cover on the male die 1, performing die pressing, solidifying and demolding to obtain a hemispherical honeycomb structure core layer; in the mould pressing solidification process, the temperature is increased to 250 ℃ at the heating rate of 60 ℃/h; preserving heat for 6h under the pressure of 5 MPa; and (5) cooling to 60 ℃ for demolding.
205 Preparing flat plates with the same size as the hemispherical honeycomb structure core layer, taking the adjacent edges of each flat plate as the horizontal and vertical coordinates, paving continuous fiber prepregs on one surface of each flat plate according to angles of +45°, -45 °, 0 °, 90 °, 0 °, 45 ° and +45°, finishing one-time paving, paving for 2-10 times, and heating and solidifying the flat plates after the paving is finished to obtain a bottom plate; wherein, in the heating and curing process of the bottom plate, the temperature is raised to 120 ℃ at a heating rate of 90 ℃/h; preserving heat for 2h under the pressure of 1 MPa;
206 Adhering the two bottom plates to the upper end face and the lower end face of the hemispherical honeycomb structure core layer through an adhesive, and solidifying to obtain the sandwich plate with the hemispherical honeycomb core layer.
The thickness of the single layer laid by the continuous fiber prepreg is 0.05-0.3mm.
Continuous fiber prepreg cut tape constructions include plain weave and twill weave.
A plurality of induction holes penetrating through the sandwich plate are formed in the periphery of the sandwich plate with the hemispherical honeycomb core layer at intervals; when the hole is opened, the rotating speed of the cutter is 1000-3000r/min, the feeding rate is 40-300mm/min, the feeding amount is 0.02-0.5mm, in the embodiment, the rotating speed of the cutter is 1200r/min, the feeding rate is 120mm/min, and the feeding amount is 0.05mm.
The upper plate 2 of the female die comprises a connecting layer 202 and a top layer 203 from bottom to top, the hemispherical groove 201 is positioned on one end surface of the connecting layer 202, the other surface of the connecting layer 202 is provided with protrusions 204 which are in one-to-one correspondence with the hemispherical grooves 201, and one side of the top layer 203 is provided with a top layer groove 205 which is in one-to-one correspondence with the protrusions 204; the top layer 203 is circumferentially spaced apart with upper armrests 206 and the lower plate 101 is circumferentially spaced apart with lower armrests 103.
The glass transition temperature of the resin used by the continuous fiber prepreg is more than or equal to 160 ℃; the resin content in the continuous fiber prepreg was 29wt%.
The adhesive is adhesive film and the resin base is epoxy resin.
The continuous fibers in the continuous fiber prepreg comprise one or more of carbon fibers, glass fibers, basalt fibers, quartz fibers and aramid fibers; the resin matrix in the prepreg comprises at least one of epoxy resin, polyimide resin, bismaleimide resin, benzoxazine resin or phthalonitrile; the continuous fiber in this embodiment is a T700 unidirectional carbon fiber, and the resin matrix in this embodiment is an epoxy resin.
The single-layer thickness of the continuous fiber prepreg was 0.4mm, the volatile content was 10%, and the areal density of the continuous fiber prepreg was 280g/m 2 。
The physical properties of the sandwich panel of the hemispherical honeycomb core layer obtained in this example are shown in table 2.
Example III
The present embodiment is an improvement over the first embodiment, and is different from the first embodiment only in that
The continuous fibers in the continuous fiber prepreg are T700 carbon fiber fabrics.
The resin base is polyimide resin.
The resin matrix of the binder is polyimide resin.
The physical properties of the sandwich panel of the hemispherical honeycomb core layer obtained in this example are shown in table 3.
Example IV
The present embodiment is an improvement over the first embodiment, and is different from the first embodiment only in that
The continuous fibers in the continuous fiber prepreg are basalt fibers and quartz fibers.
The resin base is a bismaleimide resin.
The resin matrix of the binder is a bismaleimide resin.
The physical properties of the sandwich panel of the hemispherical honeycomb core layer obtained in this example are shown in table 4.
Table 1 physical properties of the hemispherical honeycomb sandwich panel of example one
Table 2 physical properties of hemispherical honeycomb sandwich panel of example two
Table 3 physical properties of hemispherical honeycomb sandwich panel of example three
Table 4 physical properties of hemispherical honeycomb sandwich panel layer of example four
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A preparation method of a sandwich panel with a hemispherical honeycomb core layer is characterized by comprising the following steps: the method comprises the following steps:
preparing a die, wherein the die comprises a male die (1) and a female die, the male die (1) comprises a lower plate (101), a plurality of hemispherical bosses (102) are uniformly distributed on the upper end surface of the lower plate (101) at intervals in the transverse and longitudinal directions, the female die comprises an upper plate (2), and hemispherical grooves (201) which are in one-to-one correspondence with the hemispherical bosses (102) are formed in the lower plate surface of the upper plate (2);
cutting a continuous fiber prepreg into a plurality of strip-shaped paving materials in long strips and a plurality of sector paving materials matched with a hemispherical boss (102);
the method comprises the steps that two adjacent edges of a lower plate (101) are on the horizontal and vertical coordinates, a plurality of strip-shaped paving materials are paved on hemispherical bosses (102) of each corresponding row according to set angles, after each row of strip-shaped paving materials are paved, each hemispherical boss (102) is divided by taking the strip-shaped paving materials as datum lines, sectors Pu Cai are coated on two sides of each hemispherical boss (102) covered with the strip-shaped paving materials, coating of the hemispherical bosses (102) of each row is completed according to the process, and the set angles are sequentially +45°, -45 °, 0 °, 90 °, 0 °, -45 ° and +45 °;
repeating the process for 2-10 times, laying, covering a female die on a male die (1), performing die pressing and curing on the core layer, and demolding to obtain a hemispherical honeycomb structure core layer;
preparing flat plates with the same size as the hemispherical honeycomb core layer, taking the adjacent edges of each flat plate as the horizontal and vertical coordinates, paving continuous fiber prepregs on one surface of each flat plate according to angles of +45°, -45 °, 0 °, 90 °, 0 °, 45 ° and +45°, finishing one-time paving, paving for 2-10 times, and heating and solidifying the flat plates after paving to obtain a bottom plate;
and adhering the two bottom plates to the upper end face and the lower end face of the hemispherical honeycomb structure core layer through an adhesive, and curing to obtain the sandwich plate with the hemispherical honeycomb core layer.
2. The method for manufacturing a sandwich panel with hemispherical honeycomb core according to claim 1, wherein: a plurality of induced holes penetrating through the sandwich plate are formed in the sandwich plate with the hemispherical honeycomb core layer at intervals in the circumferential direction.
3. The method for manufacturing a sandwich panel with hemispherical honeycomb core according to claim 2, characterized in that: in the heating and curing process of the bottom plate, the temperature of the bottom plate is 60 ~ Heating to 60 ℃ at a heating rate of 90 ℃/h ~ 120 ℃; at 0.3 ~ Preserving heat under 1MPa pressure of 0.5 ~ 2h。
4. A method of making a sandwich panel with hemispherical honeycomb core according to claim 3, characterized by: the adhesive is resin-based adhesive film or glue, wherein the resin-based adhesive film or glue is one of epoxy resin, bismaleimide resin, benzoxazine resin or phthalonitrile.
5. The method for manufacturing a sandwich panel with hemispherical honeycomb core according to claim 4, wherein: in the core layer mould pressing solidification process, the temperature is increased to 120-280 ℃ at the heating rate of 30-60 ℃/h; preserving heat for 1-6 h under the pressure of 0.3-5 MPa;
and (5) lowering the temperature to 20-60 ℃ for demoulding to obtain the hemispherical honeycomb structure core layer.
6. The method for manufacturing a sandwich panel with hemispherical honeycomb core according to claim 5, wherein: the inner diameter of the induction hole is 12-26mm; the thickness of the bottom plate is 0.54-2.5mm.
7. The method for manufacturing a sandwich panel with hemispherical honeycomb core according to claim 6, wherein:
the continuous fiber in the continuous fiber prepreg comprises one or more of carbon fiber, glass fiber, basalt fiber, quartz fiber and aramid fiber.
8. The method for manufacturing a sandwich panel with hemispherical honeycomb core according to claim 7, wherein: the upper plate (2) of the female die comprises a connecting layer (202) and a top layer (203) from bottom to top, the hemispherical grooves (201) are positioned on one end face of the connecting layer (202), the other face of the connecting layer (202) is provided with protrusions (204) which are in one-to-one correspondence with the hemispherical grooves (201), and one side of the top layer (203) is provided with a top layer groove (205) which is in one-to-one correspondence with each protrusion (204);
the top layer (203) is circumferentially provided with upper armrests (206) at intervals, and the lower plate (101) is provided with lower armrests (103) at intervals;
the resin matrix in the prepreg comprises at least one of epoxy resin, polyimide resin, bismaleimide resin, benzoxazine resin or phthalonitrile;
the number of the hemispherical bosses is 10-100; the diameter of the hemispherical boss is 10-100mm, and the diameter of the hemispherical groove is 12-106mm.
9. The method for preparing the sandwich panel with the hemispherical honeycomb core layer according to claim 8, wherein:
the glass transition temperature of the resin used by the continuous fiber prepreg is more than or equal to 160 ℃; the resin content in the continuous fiber prepreg is 29-44 wt%;
the single-layer thickness of the continuous fiber prepreg is 0.05-0.4 mm, the volatile content is 5-10%, and the areal density of the continuous fiber prepreg is 50-280 g/m 3 ；
The male die and the female die are made of one of steel, aluminum and silicon rubber, and the linear expansion coefficient of the selected materials of the male die and the female die is 3-11 multiplied by 10 -6 And the roughness Ra is less than or equal to 1.5 at the temperature of/DEGC.
10. Sandwich panel with hemispherical honeycomb core obtained on the basis of the process for the preparation of sandwich panels with hemispherical honeycomb core according to any of claims 1-9, characterized in that: the composite material comprises a core layer, wherein a bottom plate is adhered to the upper end face and the lower end face of the core layer.
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Application publication date: 20231205 |